Angle grinding spindle



y 3, 1938. A. w. MALL I 2,116,491

ANGLE GRINDING SPINDLE Filed Dec. 19, 1956- Patented May 3, 1938 UNITEDSTATES PATENT OFFICE ANGLE GRINDING SPINDLE Arthur William Mall,Chicago, 111.

Application December 19, 1936, Serial No. 116,770 4 Claims. (01. 51-470)My invention relates to improvements in angle spindles and similardevices for supporting grinding wheels.

My invention relates more particularly to angle spindles for use inconnection with face grinding on rail joints and other places uponrailway tracks. a

The principal object of the present invention is to provide an improvedangle spindle for support- 1() ing a grinding wheel.

A further object is to provide in an angle spindle of the type describedan improved handle and guard member.

A further object is to provide in an angle spindle of the type describedimproved means for permitting an operator to throw his weight on-thegrinding wheel during operation, thereby causing quicker and moreefficient grinding.

A further object is to provide an improved attachment for an anglespindle of the type described whereby all of the above objects can beaccomplished.

Other objects and advantages will be more apparent from the followingdescription wherein reference is had to the accompanying sheet ofdrawings upon which Fig. 1 is a front perspective view of my improvedangle spindle and grinding wheel in working position on a track railjoint;

Fig. 2 is a plan view thereof; and

Fig. 3 is a sectional view through the spindle handle and guard membertaken on the lines 33 of Fig. 2.

The angle spindle which I have chosen to illustrate my invention may begenerally similar to that shown in the patent to Arthur William Mall,granted on August 28, 1924, No. 1,971,790, the only difference beingthat no water valve and connection therefor is included, inasmuch aswater is not used for the grinding wheel to which this applicationrelates.

The unit may include an angle casing 10 having a flexible drive shaft 12connected thereto for the purpose of driving a vertical spindle l4suitably mounted therein and provided at its lower end with a facegrinding wheel I6. The grinding wheel is provided with a protective topand side covering member l8 which prevents an operator from coming intobodily contact with the side or top portions of the grinding wheel. Theangle spindle casing 10 is provided with a handle member 20 extending atright angles to the flexible drive shaft housing 22, and in the devicesof 55 the prior art this handle has been employed to guide andmanipulate the grinding wheel during use of the same.

In accordance with my invention I have provided a combined guard andhandle extension 24 which is formed with a square block 26 welded 5 tothe bottom side thereof. The block 26 may be formed with a taperedopening 28 to fit over the tapered handle 20 and be locked thereon by aset screw 30. The combined guard and handle extension is provided at itsforward end with a 10 vertical rod member 32 screw threadedly mountedtherein. The member 24 may be generally shaped as shown to be positionedwhen mounted in an operative manner over one side of the grinding wheelso that pressure may be brought to bear 15 upon one side thereof only.For example, as shown in Figs. 1 and 2, the grinding wheel is being usedupon the joint between the rail sections a and b, and as will beevident, the operators forearm and hand may be rested upon the same tobring a considerable pressure upon the grinding wheel at the particularpoint where the grinding operation is taking place.

A great many advantages have been found to result from the aboveconstruction. For example, when grinding on a track with thisconstruction, it is possible for the operator to place his weight on theassembly, which eliminates a certain amount of fatigue and enables theoperator to grind more steadily. It is also possible 30 to maneuver thegrinding wheel to permit grinding on a very small surface of the railsto be ground. The amount of grinding at one point is also regulated,depending upon how much the operator presses down on the combined handleand 35 guard extension.

It is frequently desirable in grinding with a wheel of this type, togrind a comparatively small spot, say 2" long. Without the specialhandle member it is very difficult to keep the grinding ef- 40 fort on asmall spot, the entire grinding wheel being approximately 8" indiameter, which makes it difficult to handle the assembly by the use ofthe handle 20. With the construction I have provided, the operator maytip the wheel as he is grinding to conform to the contour of the railsurface.

Another advantage of this construction lies in the fact that an operatormay more easily lift the grinding assembly with one hand to examine thework, thus saving considerable time for the operator in a grindingoperation. It is also 0b vious that with the additional member 24secured to the casing handle, the entire assembly may be laid upon itsside resting upon the grinding wheel shield l8 and the edge of themember 24. This position may be had while the grinding wheel is inmotion. In this manner the member 24 acts as a bracket to hold the faceof the grinding wheel in a vertical position.

While the exact shape or position of the member 24 may be varied ifdesired, it will be obvious that to position the same generally as shownand provide a comparatively broad surface, that it makes an ideal armrest for the operator and permits him to place considerable weight uponthe grinding wheel without having any parts of his arm become sore orbruised.

While I have illustrated and described a specific embodiment of myinvention, it will be apparent to those skilled in the art that changesand modifications'may be made in the exact details shown, and I do notwish to be limited in any particular, rather what I desire to secure andprotect by Letters Patent of the United States is:

1. Apparatus of the class described comprising an angle shaped casinghaving a vertical drive spindle therein, a flexible drive shaft for saidspindle extending from a side of said casing, a face grinding wheelsecured to the lower end of said spindle, a handle on said casing formedintegral therewith and extended horizontally therefrom and a combinedguard and platform member secured on the top of said handle and extendedover only one side of said grinding wheel.

2. Apparatus of the class described comprising an angle shaped casinghaving a vertical drive spindle therein, a flexible drive shaft for saidspindle extending from a side of said casing, a face grinding wheelsecured to the lower end of said spindle, a handle on said casing formedintergral therewith and extended horizontally therefrom and a combinedguard and platform member secured on the top of said handle and extendedover only one side of said grinding wheel, said combined guard andplatform member having a vertical auxiliary handle secured at one endthereof.

3. Apparatus of the class described comprising an angle spindle, agrinding wheel secured to the lower end thereof, a drive for saidgrinding wheel including a flexible shaft entering the side of saidangle spindle, a handle on said angle spindle at right angles to saidflexible shaft and a platform member connected to said handle, saidplatform member being flat and overlying one side of said grinding wheelwhereby an operator may bring pressure on only one side of said grindingWheel, said platform having a vertical post member at its forward end toprovide a hand gripthereon.

4. Apparatus of the class described comprising an angle shaped casinghaving a vertical drive spindle therein, a flexible driveshaft for saidspindle extending from a side of said casing, a face grinding Wheelsecured to the lower end of said spindle, a protective top and sidecovering member for said grinding wheel, a handle on said casing formedintegral therewith and extending horizontally therefrom, and a combinedguard and platform member secured on the top of said handle whereby theentire assembly may be laid on one side resting on the grinding Wheelside covering and the edge of the guard and handle member.

ARTHUR WILLIAM MALL.

